I was having this discussion with my 4 year old the other day. I was saying to him how I felt sorry for Pluto because it used to be a planet but got demoted. His reasoning was it is better for Pluto to be a dwarf planet because then it means we get to include Ceres and the other one (forgotton its name) in the solar system pictures and the more planets the better in his eyes!
One of his books calls them Plutoids which is much nicer than dwarf planet and a bit of a consolation prize for poor Pluto
